package com.cw.encdec.sm;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import cn.hutool.core.codec.Base64;

public class SM4Utils {
    //	private String secretKey = "";
    //    private String iv = "";
    //    private boolean hexString = false;

    public String secretKey = "";
    private String iv = "";
    public boolean hexString = false;

    public SM4Utils() {
    }
    //
    //    public byte encryptData_ECB1(byte[] inputStream){
    //        try
    //        {
    //            SM4_Context ctx = new SM4_Context();
    //            ctx.isPadding = true;
    //            ctx.mode = SM4.SM4_ENCRYPT;
    //
    //            byte[] keyBytes;
    //            if (hexString)
    //            {
    //                keyBytes = Util.hexStringToBytes(secretKey);
    //            }
    //            else
    //            {
    //                keyBytes = secretKey.getBytes();
    //            }
    //
    //            SM4 sm4 = new SM4();
    //            sm4.sm4_setkey_enc(ctx, keyBytes);
    //            String cipherText = new BASE64Encoder().encode(inputStream);
    //            if (cipherText != null && cipherText.trim().length() > 0)
    //            {
    //                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
    //                Matcher m = p.matcher(cipherText);
    //                cipherText = m.replaceAll("");
    //            }
    //            return cipherText;
    //        }
    //        catch (Exception e)
    //        {
    //            e.printStackTrace();
    //            return (Byte) null;
    //        }
    //    }

    public String encryptData_ECB(String plainText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;

            byte[] keyBytes;
            if (hexString) {
                keyBytes = Util.hexStringToBytes(secretKey);
            } else {
                keyBytes = secretKey.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("GBK"));
            String cipherText = Base64.encode(encrypted);
            if (cipherText != null && cipherText.trim()
                .length() > 0) {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String decryptData_ECB(String cipherText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            if (hexString) {
                keyBytes = Util.hexStringToBytes(secretKey);
            } else {
                keyBytes = secretKey.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Base64.decode(cipherText));
            return new String(decrypted, "GBK");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String encryptData_CBC(String plainText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString) {
                keyBytes = Util.hexStringToBytes(secretKey);
                ivBytes = Util.hexStringToBytes(iv);
            } else {
                keyBytes = secretKey.getBytes();
                ivBytes = iv.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("GBK"));
            String cipherText = Base64.encode(encrypted);
            if (cipherText != null && cipherText.trim()
                .length() > 0) {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String decryptData_CBC(String cipherText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString) {
                keyBytes = Util.hexStringToBytes(secretKey);
                ivBytes = Util.hexStringToBytes(iv);
            } else {
                keyBytes = secretKey.getBytes();
                ivBytes = iv.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Base64.decode(cipherText));
            return new String(decrypted, "GBK");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) throws IOException {
        String plainText = "ererfeiisgod";

        SM4Utils sm4 = new SM4Utils();
        sm4.secretKey = "JeF8U9wHFOMfs2Y8";
        sm4.hexString = false;

        System.out.println("ECB模式加密");
        String cipherText = sm4.encryptData_ECB(plainText);
        System.out.println("密文: " + cipherText);
        System.out.println("");

        plainText = sm4.decryptData_ECB(cipherText);
        System.out.println("明文: " + plainText);
        System.out.println("");

        System.out.println("CBC模式加密");
        sm4.iv = "UISwD9fW6cFh9SNS";
        cipherText = sm4.encryptData_CBC(plainText);
        System.out.println("密文: " + cipherText);
        System.out.println("");

        plainText = sm4.decryptData_CBC(cipherText);
        System.out.println("明文: " + plainText);

        System.out.println("CBC模式解密");
        System.out.println("密文：4esGgDn/snKraRDe6uM0jQ==");
        String cipherText2 = "4esGgDn/snKraRDe6uM0jQ==";
        plainText = sm4.decryptData_CBC(cipherText2);
        System.out.println("明文: " + plainText);
    }
}